Propeller.



PATENTED SEPT. 17, 1907.

7. o 96 1 u N Ouml SEM. KLD GLB AEM Jr WRW VPN G M I L P P A GEORGE ,W.JACKSON, .OF PHILADELPHIA, PENNSYLVANIA.

- PROPELLER.

Specification of Letters Patent.

i Patented Sept. 17, 1907.

Application i'iled January 31,1907. Serial N0- 355,006-

To all whom, 'it 'may concern:

De it known rthat I, GEORGE W. JACKSON, a citizen of the VUnited States,residing in the city and county of Philadell'ihia, State elPennsylvania, have invented a new and useful Improvement, in Propellers,of which the following is a specification.

My invention consists. .of an improvement in propellers, whereby thenumber of blades may be varied and set in different positions or spacesapart, and means are provided for securing the blades to the hub in afirm and reliable manner. i I

lt also consists of details of construction as will be hereinafter setforth and pointed out in the claims.

Figure 1 represents a perspective view of a propellerembodying'my-invention. Fig. 2 represents a central longitudinal sectionthereof. Fig. 3 represents a face View of one of the blades detached.Fig. 4 represents a perspective view of the hub of the propeller.

Similar letters of reference indicate corresponding parts in thefigures.

Referring to the drawings: A designates a propeller sl1aft,`and Bdesignates the hub ofthe propeller mounted thereon. p A

C. designates the blades of the propeller, the .same in the present casebeing three in number, of any suitable construction, excepting that .thehub portions D of the bladesl have series of matched openings E arrangedin circular form around the central opening or bore E, which latterreceives said shaftA.

The hub B consists of the collar F and neck G, and is separate from theblades, said collar and neck having a bore to receive the propellershaft. In the collar F are openings H which extend in the longitudinaldirection of the same, and to the same are secured the .pins or studs .Twhich project rearwardly therefrom parallelwith said openings.

K designates screws or bolts, which are passed i through openings H inthe hub, and corresponding openings E in the blades, it being noticedthat the pins or studs J pass through other openings in said hub.

On the rear ends of the bolts K, are the nuts L 'which are adapted totighten against the hub portion of the adjacent blade, it being noticedthat the several hub portions of the blades are placed one on the other.on the shaft and against the hub member and clamped together so that'they are firmly Iconnected with the hub B as one. The nuts and adjacentends of the bolts are inclosed by the cap`M, which is ttedon the end ofthe shaft A and covers said parts, its inner face being somewhatrecessed for. that purpose, said cap in the present case being securedin position on the shaft by the key N which is inserted in the shaft orfastened in any other suitable manner.

It will be noticed that when the cap is removed and the nuts L areunscrewed, the blades may be tted on the hub, it being seen that certainopenings E of the hub portions D of the blades receive correspondingpins or studs J it being evident that the number of blades and theirdistances apart, or positions relatively to each other may be varied asdesired. It will be noticed also that the bolts K extend parallel withthe 'studs J, and consequently with the openings H and E, thus avoidingthe piercing of the peripheries of the hub portions D of the blades toreceive securing bolts, which otherwise would weaken said peripheriesand provide projections thereon.

When a plurality of blades are employed, they are properly spaced apartand their hub portions placed one on the other on the shaft and againstthe hub mem- -ber as has been stated, the relative openings thereofreceiving the pins or studs I. Then the bolts K are passed through theopenings H of the collar F and the other openings E of the hub portionsD. The nuts L are then applied to the bolts and tightened thereon,whereby the blades are firmly connected with the hub and prevented fromdisplacement in either longitudinal or rotary directions. The cap M isalso placed in position, .whereby the nuts L are inclosed and concealedWhile I have specified certain means for carrying out my improvements, Ido not wish to be limited exactly to the same, but desire to make suchchanges as may come within the scope'of the novelty involved,

as for instance, two bladesmay be connected as one and having asinglehub portion which'is provided with a central opening to receivethepropeller shaft, and a series of openings around the same for thepurposes of connection with the shaft, the same as shown in the singleblade, Fig. 3.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is:-y

1. In a propeller, a blade having a hub portion, a hubmelnber which isseparate from said portion, said member and portion having each acentral bore to receive a propeller shaft, and a lseries of openingssurrounding said central bore, and separate devices for adjusting andsecuring the blades on said member, said devices extending parallelthrough said portion and member.

2. In a propeller, a plurality of blades,V each having a.' hub portion,a'hub member from which the hub portions are separate, means on saidportions and member for adjusting the blades, and`separate means onsaidportions and member for clamping the same,vv said means beingrespectively parallel said hub member'and the hub portions of the bladeshavingeach a bore to receive a propeller shaft.

3. In a propeller, a plurality of, blades, a hub member and fasteningdevices, said blades being separable from said member and provided intheir hub portions'wthv openings, and openings to receive said fasteningdevices,

which are also adapted to enter other openings ot said matchedopenings', projections on said hub member adapted to `receive arespective number of the openings of said hub portions, fasteningdevices adapted to pass through,

said hub member and other openings in the hub portion, and means fortightening said devices.

5. ln a propeller, a blade, and a hub member, said blade being separablefrom said member, a bolt passed through said member and the hub portionof said blade, a tightening device on said bolt, and a closure forsaidhub portion over the end of the tightening device thereat.

, 6. In a propeller, a blade, and a hub member, said blade bcingseparatefrom said member, a securing bolt passing through said member and hubportion of said blade, a nut on said bolt, and a closure over said nutand adjacent end of the bolt, the same being adapted to be secured tothe shaft of the propeller. v

7. In a propeller,' a blade having a hub portion, a hub member, which isseparate from said portion, said member and portion having' centralbores respectively to receive a propeller shaft, and openingsbetwcen'said bores and the peripheries of said parts, a stud projectingfrom the side o'f said hub member adapted to enter an opening in the hubportion,. and a bolt adapted to be passed through another opening insaid portion, said stud and bolt being adapted to extend in thedirection of the length of the propeller shaft.

8. ln a propeller shaft, a plurality of blades, each having a hubportion, a hub member which is separate from said portion, said portionand member having bores therein to receive a propeller shaft, and havinga plurality of openings around said bore, a stud projecting from saidmember adapted to enter one of the openings of said hub portion,

and a bolt adapted to pass through another opening of said hub portion,and a corresponding opening'in the hub member, and means for tighteningsaid bolts, said openings, stud and bolt extending in the direction ofthe length of the propeller shaft.

GEORGE W. JACKSON. Witnesses l' JOHN A. wmoi-msnmiu, HARRY C.' DAL'roN.

